| The research of this paper is based on the previous research results in the area and the existing exploration data,and uses sedimentology as a research guide and integrated tectonics,stratigraphy,geophysics,geochemistry,basin analysis,restoration of paleogeomorphology,etc.Based on the theory and methods,through comprehensive analysis of field outcrops,drilling,logging,and scanning electron microscopy?SEM?and cast thin sections,the sedimentary facies types and depositional regularity of the sedimentary facies of the Hari Sag in the central and northern part of the Yin'e Basin were studied.Regional reservoir characteristics of four characteristics.The stratum of the study area is mainly based on the characteristics of biofossil combinations,earthquakes,lithology,and well logging properties.The comprehensive study is divided into the Cretaceous from bottom to top and can be divided into the Lower Cretaceous Basin Gewall Formation?K1b?Su Hongtu Formation?K1s?and Yingen Formation?K1y?,and Upper Cretaceous Wulansuhai Formation?K2w?,the underlying strata are Late Paleozoic Carboniferous-Permian strata.This paper identified the main types of sedimentary microfacies developed in the study area,including rivers,fan deltas,lakes,alluvial fans,and five types of sedimentary facies of near-shore subaqueous fans.It can be further divided into thirteen subfacies,more than twenty.Microfacies.The Permian is mainly composed of marine-continental transitional facies and alluvial fan sediments.The first member of the Baji River is mainly an inshore subaqueous fan or alluvial fan.The second member of the Baji Segment is mainly fan deltaic.The first member of the Su-1 Member mainly develops fan-delta sediments,and the second member of the Su?Segment develops a fan.In the delta or lacustrine facies,the Yingen Formation is mainly lacustrine facies,and the Wulansuhai Formation is mainly fluvial facies.In this dissertation,based on the summary of the lithology,physical properties,electrical properties and oil-bearing characteristics of the reservoirs in the study area,the“quadruple”relationships in the study area were studied,and a comprehensive analysis was conducted to find the physical and electrical limits of the four types of favorable reservoirs.:Dolomite(porosity 5%,permeability 0.016×10-3?m2,acoustic wave time difference 217.2?m/s,resistivity 2.7?·m);glutenite(porosity 6.9%,permeability0.086×10-3?m2,time difference of sound waves 269?m/s,resistivity 2.7?·m);carbonate mudstone(porosity 4.2%,permeability 0.014×10-3?m2,acoustic time difference 228.8?m/s,resistivity 6?·m);volcanic rock(porosity 3.8%,The permeability is 0.01×10-3?m2,the acoustic time difference is 314.4?m/s,and the resistivity is 2.4?·m).At the end of this paper,the sedimentary mechanisms of the four favorable reservoir lithologies are analyzed on the basis of the study of the sedimentary facies and the four characteristics of the reservoir. |
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